直接上代码,通过以下计算就可以完成链接的识别以及替换,然后添加高亮以及对高亮文字添加点击事件
let label = YYLabel()
label.backgroundColor = .red
label.numberOfLines = 0
label.preferredMaxLayoutWidth = 200
view.addSubview(label)
label.snp.makeConstraints { (make) in
make.left.equalTo(50)
make.width.equalTo(200)
make.top.equalTo(300)
}
var urls: [String] = []
var string = "test\\n\ntest/\\n\n😂\nhttps://mbd.baidu.com/newspage/data/landingsuper?context=%7B%22nid%22%3A%22news_9827769369551786176%22%7D&n_type=0&p_from=1 第二个 https://weibo.com/mygroups?gid=201209041125312675&wvr=6&leftnav=1&isspecialgroup=1 今天又是好天气!今天又是好天气!今天又是好天气!今天又是好天气!今天又是好天气!";
// var string = "est\\n\ntest/\\n\n😂\nhttps://www.weibo.com/beat/beatslist/beat?keyword=测试 https://weibo.com/mygroups?gid=201209041125312675&wvr=6&leftnav=1&isspecialgroup=1 每天都很美好";
let detector = try? NSDataDetector.init(types: NSTextCheckingResult.CheckingType.link.rawValue)
let matches = detector?.matches(in: string, options: [.reportProgress], range: NSRange(location: 0, length: string.count))
for match in matches! {
if match.resultType == .link {
if let url = match.url {
//这里获取到的url是经过encode处理的
urls.append(url.absoluteString)
}
}
}
print("encode urls \(urls)")
let font = UIFont.systemFont(ofSize: 15)
let attribbutes = NSMutableAttributedString(string: "")
for str in urls {
var strArray = string.components(separatedBy: str)
if strArray.count < 2 {
//如果没有匹配到字符说明string没有经过encode,但是str为encode以后的字符,所以需要decode str才能识别
if let decode = str.removingPercentEncoding {
strArray = string.components(separatedBy: decode)
}
}
if let firstStr = strArray.first {
let subAttribute = NSMutableAttributedString(string: firstStr)
subAttribute.setColor(.cyan, range: NSRange(location: 0, length: firstStr.count))
attribbutes.append(subAttribute)
let hightText = YYTextHighlight()
hightText.tapAction = { view, text, range, rect in
guard let url = URL(string: str) else {
print("error url \(str)")
return
}
print("open url \(url)")
UIApplication.shared.open(url, options: [:], completionHandler: nil)
}
let imageAttribute = NSMutableAttributedString.attachmentString(withContent: UIImage(named: "commend_kink"), contentMode: .scaleAspectFit, attachmentSize: .init(width: 18, height: 18), alignTo: font, alignment: .center)
let replaceStr = NSMutableAttributedString(string: "查看链接")
replaceStr.setColor(.yellow, range: NSRange(location: 0, length: 4))
imageAttribute.append(replaceStr)
imageAttribute.setTextHighlight(hightText, range: NSRange(location: 0, length: 5))
attribbutes.append(imageAttribute)
}
if let lastStr = strArray.last {
string = lastStr
}
}
let lastAttribute = NSMutableAttributedString(string: string)
lastAttribute.setColor(.cyan, range: NSRange(location: 0, length: string.count))
attribbutes.append(lastAttribute)
label.attributedText = attribbutes
注意点YYLabel UILabel用法差异
使用YYLabel和使用UILabel还是有一些区别的。如果使用UILabel设置了lable的font、textColor,在给label的text赋值或者attributedText赋值时,上述设置都会生效。但是YYLabel设置font、textColor只会对label的text生效,对于attributedText属性必须对NSAttributedString、NSMutableAttributedString进行设置。
YYLabel高度自适应 preferredMaxLayoutWidth
对于UIlabel仅设置label.numberOfLines = 0,并且不设置高度lable就会随着显示内容自动增长,但是对于YYLable除了设置label.numberOfLines = 0,还要设置label.preferredMaxLayoutWidth,只有这样YYLabel才会自增长。
String NSString 对于表情NSRange计算长度不同
由下图可以看出对于纯文字不管是String类型NSString计算结果都一样。但是对于含有表情的文本计算,两者计算结果不一样。对于这种情况可以使用NSString计算也可以使用String调用.utf16.coun计算。NSString默认使用utf16计算,而表情大部分也需要使用utf16计算,所以直接使用NSString就可以得到正确的结果。
let range = NSMakeRange(0, string.count)
let nsStr = string as NSString
let conTentRange = NSMakeRange(0, nsStr.length)
//let conTentRange = NSMakeRange(0, string.utf16.count)
printf("range \(range) conTentRange \(conTentRange) text \(text)")
YYTextHighlight和父视图手势会冲突问题
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
//YYTextHighlight和父视图手势会冲突,所以需要识别点击位置是否包含YYTextHighlight
if touch.view is YYLabel {
let label = touch.view as? YYLabel
if let label = label {
var range = NSMakeRange(0, 1);
let highlight = label._getHighlight(at: touch.location(in: label), range: &range)
if highlight != nil {
return false
}
}
}
return true
}
上边代码中-(YYTextHighlight *)_getHighlightAtPoint:(CGPoint)point range:(NSRangePointer)range;为私有方法,外部不可调用,又考虑到引用的是别人的第三方库,所以需要创建一个YYLabel的分来,然后将此方法在YYLabel分类的.h中声明。如下:
#import "YYLabel.h"
NS_ASSUME_NONNULL_BEGIN
@interface YYLabel (YHYYLabel)
- (YYTextHighlight *)_getHighlightAtPoint:(CGPoint)point range:(NSRangePointer)range;
@end
NS_ASSUME_NONNULL_END